* 2 of the top 7 programming languages in use on GitHub are Microsoft created and maintained.
* Jockeying for top place among companies contributing code to projects on GitHub, for 4 years running.
* Top 5 contributor to the Linux Kernel
* Massively popular IDE in VSCode
* Enormous contributions to Kubernetes and the entire community around it,including creating/maintaining Helm.
* Big parts of Azure are open source, including their kubernetes implementation, ML toolkits, IOT components, and even the infrastructure underneath the whole thing, Service Fabric. (Demonstrably capable of orchestrating the varied workloads and scale of the second largest cloud provider in the world).
* Owner/maintainer of GitHub, which for better or worse is the platform for the vast majority of open source.
I don't like windows, I don't like office, and I don't like this move... But let's try to maintain some intellectual honesty here. Microsoft is not anywhere near a "basic" contributor to open source.